Mirror position indicating device for telephone switches



Sept. 26, 1950 A.'O. JORGENSEN MIRROR POSITION INDICATING DEVICE FOR TELEPHONE SWITCHES Flled Feb 2a, 1946 12 I l? r/ lg. I 9

III v 612250; J. 0.J01 9e r ,se rz/ UNITED STATES PATENT OFFICE MIRROR POSITION INDICATING DEVICE FOR TELEPHONE SWITCHES Anders Ossian Jiirgensen, Traneberg, Sweden, assignor to TelefonaktiebolagetL M Ericsson, Stockholm, Sweden, a. company of Sweden Application February 28, 1946, Serial No. 650,976

In Sweden March 2, 1945 1 Claim. (Cl. 179-2752) The present invention relates to a device, especially for telephone plants, for indicating the position of the wiper arms of the selector. The object of the invention is to produce a device for indicating a position, said device having a 5 style, express the position of the wiper arms in simple construction and allowing clear reading. the contact field. This is obtained according to the invention chief- The level of the mirrors is chosen so that, on ly in a wiper arm and a guiding device for said being close to the bottom plate, in the prolongaarm being provided with a mirror and a'scale tion of the direction of rotation of the wiper respectively, which are arranged so, that the i arms, it is easy to read the scale-value, in front position of the wiper arm can easily be read in of which the respective mirror lies, whereby the the mirror. X-value has to be read on the left, and the Y- The invention will be described more clearly valueon the right. with reference to the accompanying drawing. The invention is naturally not limited to the Fig. 1 schematically shows a part of a selector l5 embodiment shown in the figure. Many modifiwith two directions of rotation X and Y, perpencations are conceivable. Thus, for instance, the dicular to each other. Fig. 2 shows the device scales may be fastened on the wiper arms and for indicating the position in a selector accordthe mirrors on the guide rails, the advantage ing to Fig. 1. being, that the positions of the wiper arms could The selector according to Fig. 1 is mounted on always be read at two places, fixed in relation a bottom plate H. To the left on the bottom to the bottom plate and the frame. plate, there is the driving means I2 of the selec- I claim: tor, which in a way known per se is arranged to In a telephone Selector, a plurality of Sets of be able to revolve two horizontal shafts l3, l4, Wiper arm assemblies h mp sin a w p r of which one is hiding. the other in Fig. 1. The 2.! arm element movable in a rectilinear path and a ends of the shafts are cradled in a bearing guide element for said wiper a element, the bracket I5. The wiper arms of the selector are wiper arm elements of all of said sets bein rconnected to a flexible conductor 19. They are ranged i yr i nsh p f r m v men at first moved in the X-direction, on the shaft in paths parallel to one another, a scale coml3, revolving, and. then, on the shaft l4 revolvp i a pl li y of marks carried y one ing, in the Y-direction into the contact field of men of h se n a mirr r fi y secured the selector, which contact field is not shown. to the other element of such set and at such an. Upon movement in the X-direction, a .special angle as to reflect,,in a direction parallel to the wiper arm 16 is moved perpendicularly to said directions of movement of said wiper arm eledirection into the contact field, and upon moveme s, a image o a limited portion of the ment in the Y-direction another wiper arm I! responding scale, whereby the relative positions is moved into the contact field in parallel with of all of said wiper arm elements with respect said Y-direction. Said wiper arms are driven to their corresponding guide elements will be in a way known per se over gear transmissions represented by reflected scale readings visible in of the shafts l3, l4. On the bottom plate H side-by-side relation from a direction endwise of there are furthermore spring sets [8, which are said assemblies. arranged in a not shown way to be actuated by ANDERS OSSIAN JORGENSEN. the wiper arms l6, I! on said arms being in their end positions. REFERENCES CITED 2 shows perspective View of a detail of The following references are of record in the the ends of the wiper arms l6, l1, seen from the fil f this patent; part of the bottom plate NJ, on which the conductor i9 is set, The wiper arms glide along UNITED STATES PATENTS guide rails 2|, 22, respectively, provided with Number Name Date shoulders 23, 24, which run in grooves 25, 26. 1,508,465 McGhan Sept. 16, 1924 On the wiper arms [6, l1, there are small mirrors 2,052,059 Sengebusch Aug. 25, 1936 21, 28, for instance of rust resisting steel, which,

on movement of the arms, run along scales 29, 30, respectively, fastened on the guide rails 2|, 22. The figures on the scale, printed in reflected 

